Governor for gas-exhausters



(No Model.)

H. P. GREEN.

GOVBRNOR'PQR GAS EXHAUSTERS.

No. 269,282. Patented Dec. 19, 1882.

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UNITED STATES PATENT OFFICE.

ROBERT P. GREEN, OF COLUMBUS, ASSIGNOR OF ONE-HALF TO JOHN ANDERSON, OF CINCINNATI, OHIO.

GOVERNOR FOR GAS- EXHAUSTERS.

SPECIFICATION forming part of Letters Patent No. 269,282, dated December 19, 1882.

Application filed August 15, 1882. (No model.)

To all whom it may concern Be it known that I, ROBERT P. GREEN, of

Columbus, Franklin county, Ohio, have invented a new and useful Governor for Gas-EX- hausters, of which the following is a specification.

. This invention relates to a device for the automatic control and regulation of the exhauster employed to expedite the flow of gas from the hydraulic main to the condenser and other purifying apparatus ofgas-works, and formaintaining an equable action and pressure at all times.

In the accompanying drawings, Figure 1 is a front elevation of an apparatus embodying my invention, the float being shown in section. Fig. 2 is a top view. Fig. 3 is a perspective view of the rocking frame.

A may represent any customary or suitable float or pressure-indicator, that is in communi cation'with the conduit to be regulated. A stem, B, from float A, preferably adjustable in length by means of nut O, is pivoted at top to one extremity of a rocking frame, D, which is fulcrumed loosely on shaft E, which shaft is journaled in pedestal F. i

Firmly keyed to shaft E is a pulley, G, which is driven by a belt from the crank-shaft or other shaft of the steam-engine which operates the customary exhaust pump or blower. Also, keyed to shaft E is a pinion, H, which gears in a similar pinion, H, journaled in the rocking frame D. These pinions H and H gear in the manner shown in two similar spur-wheels,

"I I, which are likewise journaled in the rocking frame by shafts J J.

Each shaft J J has a friction-wheel, K K, of (nearly circular)elliptical form ,Which wheels, in the normal or horizontal condition of the rocking frame, revolve just out of contact with a drum, L, whose shaft m, being screw-threaded, occupies a nut, N, on end of the stem 0 of a customary slide throttle-valve (not shown) in the steam-supply pipe of the engine. My practice has been to construct the peripheries of the friction-wheels K K of wood; but they may be of rubber, leather, or other suitable material.

Forthepurposeofillustration,friction-wheels J J are represented in the drawings of much greater ellipticity than they have in actual use.

The operation of the device is as follows: Suppose a back-pressure-say of one inch of mercuryto press against the float A, causing the latter to rise and to throw the left-hand friction-wheel. K down against the drum L. The considerable float-pressure upward will hold the friction-Wheels periphery all the way around against that ofthe drum, causing a considerable opening of the throttle, the gas beneath the float, it will be perceived, acting as a spring or cushion,which, yielding when the salient portion of the friction-wheel impinges against the drum, follows up the retreat of the rocking frame as the less protruding portions of the friction-wheel come into play; but when the gas has, say, but one-tenth of one inch pressure, of course the float will not rise so much, only sufficient to bring the projecting portions of the friction-wheel in contact with the drum, thus moving the latter only a little at each revolution of the friction-wheel. When the gas-pressure falls below that of the atmosphere the other friction-wheel, K, is brought into action with exactly similar results, butin reverse direction in consequence of the reverse rotation of the friction-wheel. These corrections follow whether the gas-pressure be due to excessive evolution of gas or too sluggish movement of the steam-engine, or to both causes combined. When the speed of the engine and the generation of gas are mutually such as to produce the desired gas-pressure in the exhauster-pipe, the exhauster takes the gas away as fast as it is made, and when it is running so the adjustment of the float is such as to hold the friction-wheels equally out of contact with the drum; but the moment the engine runs the least bit slow or fast a backpressure or a suction, as the case may be, is formed, and the float, rising or falling accordingly, brings one or other of the friction-wheels in contact with the drum, so as to change the steam and run the engine slower or faster, as the case may be. The disposition of the parts is so contrived that in their normal condition the distance of the friction-wheels centers from the drum is such as to bring them as close as possible for said wheels to revolve without touching the drum, in order that the slightest change in either direction from the desired pressure shall bring the automatic correcting mechanism into action.

The apparatus may be adjusted for any desired normal pressure by such adjustment of the length of the stem 13 as to bring the rocking frame exactly level, when the desired pressure appears in the indicator.

Instead of the longitudinal adjustment of the stem B, the adjustment for different pressures may be obtained by connecting the stem to a Weighted lever acting on the principle of a safety-valve.

Having thus described my invention, the following is What I claim as new therein and desire to secure by Letters Patent:

1. In a gas-exhauster governor or regulator, the described combination, with a steam-engine throttle controlled by screw-shaft M, oi drum L, and with a gas-pressure gage or indicator-float, of the two elliptical Wheels K K,

journaled at opposite ends of rocking frame D and rotated in opposite directions by suit i able connection, I I H H G, with the steamengine which operates the exhaust, one end i of said frame being connected by stem B with a float, A, or other gas-pressure indicator, said elliptical wheels being so located as for one or other of them to impinge on the said drum, or to be both held aloof therefrom, according to the (for the time being) gas-pressure, substantially as and for the purpose set forth.

2. In a gas-exhauster governor or regulator, the pair of elliptical friction-wheels K K, oppositely rotated by suitable connection with the same steam-engine which drives the exhaust, and mounted in a rocking frame, I), connected with the indicator-float, and having alternate contact with a drum, L, Whose shaft is connected with the steamengine throttle, substantially as and for the purpose set forth.

In testimony of which invention I have hereunto set my hand.

It. I. GREEN.

Attestzj S. L. ltnnvns, FREDERICK B UEIINE. 

